Remove mobile Kanban task dragging

Overview

One sequential work order disables phone task dragging and restores native scrolling with focused regression coverage. Implementation and targeted verification are complete.

Scope

Phone Kanban card gestures and scroll behavior. Preserve visible task-menu moves, navigation, desktop/tablet interactions, and stored ordering. Exclude other drag surfaces, backend changes, and new ordering controls.

Technical approach

Apply the design at the card presentation boundary and remove mobile drag-only affordances. The existing shared pointer sensor also accepts touch: disabling TouchSensor alone is insufficient. Remove the card's phone touch-action restriction too.

ASCII UI preview

UI-01 Phone: Home > Kanban
[Workflow / Step v] [<] [>]
[Task A              ...]  tap opens; menu moves
[Task B              ...]  swipe vertically scrolls
[Task C              ...]  no task pickup or drag targets

UI-02 Desktop/tablet: Home > Kanban
[Step A         ] [Step B         ]
[Task A      ...] [Task C      ...]
[Task B      ...]  existing drag and keyboard reorder

Navigator stays fixed; the phone column scrolls. Layout and control order stay as shipped. Labels and spacing are illustrative. Maps to AC .1-.4.

Tests and E2E tests

AC .1/.4: extend kanban-card-regression.test.tsx and kanban-card-content.test.tsx with mobile/desktop interaction checks; cover responsive wiring in swimlane-kanban-content.render-stability.test.tsx. AC .1/.2/.3/.4: replace the positive phone drag test in mobile-kanban-reorder.spec.ts with native touch scrolling/no mutations, delayed swipe, tap/menu move, and boundary cases. Retain mobile-kanban.spec.ts for horizontal navigation and general phone flows. Run kanban-reorder.spec.ts on chromium for desktop reorder compatibility. All ACs use the prefix AC-TASKS-MOBILE-KANBAN-SCROLL-001.

Work orders

Task 01: Remove phone card dragging

Verification

(cd apps && pnpm install --frozen-lockfile)
(cd apps/web && pnpm exec vitest run components/kanban-card-content.test.tsx components/kanban-card-regression.test.tsx components/kanban/swimlane-kanban-content.render-stability.test.tsx)
(cd apps/web && pnpm run typecheck)
GOCACHE=/tmp/kandev-mobile-go-build make -C apps/backend build-dev GOFLAGS=
GOCACHE=/tmp/kandev-mobile-go-build make -C apps/backend e2e-plugin-package GOFLAGS=
(cd apps/web && pnpm run build:e2e)
(cd apps/web && pnpm e2e:run --host --no-build --project mobile-chrome tests/kanban/mobile-kanban-reorder.spec.ts tests/kanban/mobile-kanban.spec.ts tests/kanban/mobile-auto-hide-empty-columns.spec.ts)
(cd apps/web && pnpm e2e:run --host --no-build --project chromium tests/kanban/kanban-reorder.spec.ts)
python3 scripts/list-docs.py validate
python3 scripts/lint-spec-files.py --all
git diff --check

Verification results

Implemented phone drag disabling, drag-attribute removal, keyboard card activation, native touch panning, and removal of mobile drag targets. The visible Move to path and desktop/tablet sensors remain. Updated the auto-hide mobile scenario and public workflow troubleshooting guidance.

Validation on 2026-09-15:

RED: card regression failed because the phone card exposed draggable.
GREEN: the three planned Vitest files passed (29 tests initially); final card regression rerun passed 11 tests, yielding 30 passing focused cases overall.
pnpm run typecheck, targeted ESLint, prettier, deleted-path i18n guard, native build-dev, fixture packaging, and pnpm run build:e2e passed.
Initial E2E could not bind a socket inside the sandbox. Outside the sandbox, 28 existing mobile-kanban.spec.ts cases passed. The new scroll test initially assumed zero scroll after resizing; it now starts a fresh page per width and measures gesture movement from the actual baseline. One fixture also returned 404/503 before reaching the UI; no product change was made for that transient.
Final focused mobile command with E2E_DEBUG=1 E2E_PORT_OFFSET=0 and --host --no-build --project mobile-chrome, selecting mobile-kanban-reorder.spec.ts and mobile-auto-hide-empty-columns.spec.ts, passed all 6 cases without retries. Captured diagnostics: /tmp/kandev-mobile-drag-e2e.log.
Desktop kanban-reorder.spec.ts passed both pointer/persist and keyboard/persist cases with E2E_PORT_OFFSET=0 and --host --no-build --project chromium.
Specification catalog, full specification lint, and diff whitespace checks pass.

The default managed build cross-compiles unused remote helpers; verification used the native build targets and a fresh production web bundle instead. The writable Go build cache was /tmp/kandev-mobile-go-build. No backend code, API, schema, locale copy, or desktop sensor changes were required.

Risks

Shared drag code also supplies Move to; retain that action. CSS alone cannot disable sensors. Gesture tests must use actual touch input. Existing mobile reorder coverage deliberately changes expectation.

Mobile auto-hide coverage also uses the card Move to menu in this work order, replacing its removed drag-target interaction.

Rendered phone verification

The final 393px touch-scroll capture passed and was visually inspected. The focused step navigator remains fixed, lower cards and the final task are reachable, the visible menus remain present, and no mobile drag surface appears. Screenshot: /tmp/kandev-mobile-scroll-visual/kanban-mobile-kanban-reord-367ae--393px-without-moving-tasks-mobile-chrome/phone-scrolled-cards.png. The capture used the focused 393px test with --output=/tmp/kandev-mobile-scroll-visual after desktop verification, so the screenshot survives later default-output cleanup.

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